I will show concluded and current experimental work done at the Center for Quantum Devices, Copenhagen [1,2] and at CEA, Grenoble [3,4]. The work is based on electrical measurements at (sub-Kelvin) dilution-refrigerator temperatures on devices based on individual semiconductor nanowires with epitaxially-grown superconductors. Single electron spins can be confined in the nanowires, and their influence on the superconductors can be studied through their effect on the Josephson supercurrent and the discrete excitations within the superconducting gap.
1. Estrada Saldaña, J. C., Vekris, A., Sosnovtseva, V., Kanne, T., Krogstrup, P., Grove-Rasmussen, K., & Nygård, J. (2020). Temperature induced shifts of Yu–Shiba–Rusinov resonances in nanowire-based hybrid quantum dots. Commun. Phys., 3(125), 1–11.
2. Estrada Saldaña, J. C., Vekris, A., Steffensen, G., Žitko, R., Krogstrup, P., Paaske, J., Grove-Rasmussen, K., and Nygård, J. (2018). Supercurrent in a Double Quantum Dot. Phys. Rev. Lett., 121(25), 257701.
3. Estrada Saldaña, J. C., Žitko, R., Cleuziou, J. P., Lee, E. J. H., Zannier, V., Ercolani, D., Sorba, L., Aguado, R., De Franceschi, S. (2019). Charge localization and reentrant superconductivity in a quasi-ballistic InAs nanowire coupled to superconductors. Sci. Adv., 5(7), eaav1235.
4. Estrada Saldaña, J. C., Niquet, Y.-M., Cleuziou, J.-P., Lee, E. J. H., Car, D., Plissard, S., Bakkers, E.P.A.M. De Franceschi, S. (2018). Split-Channel Ballistic Transport in an InSb Nanowire. Nano Lett., 18(4), 2282–2287.
The project received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 832645.